Forced vibration

Japanese: 強制振動 - きょうせいしんどう（英語表記）forced vibration

A vibration that occurs within a vibrating system when a periodic external force (forcing force) is applied to the system, and its frequency is equal to the frequency of the forcing force. When the frequency of the forcing force is close to the system's natural frequency, the amplitude of the forced vibration becomes very large. This is called resonance. In a moderate earthquake, only a certain house may be destroyed, but this is because the natural frequency of that house happens to be close to the frequency of the earthquake, causing resonance.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

振動系に周期的な外力 (強制力) を加えるときに系内に生じる振動で，その振動数は強制力の振動数に等しい。強制力の振動数が系の固有振動数に近いときに，強制振動の振幅が非常に大きくなる。これを共鳴 (共振) という。中程度の地震の際に特定の家屋だけこわれることがあるが，これはその家屋の固有振動数がたまたま地震の振動数に近くて，共鳴を起したためである。

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